Cryptography people: using modern primitives, how would you build pay-per-view cable-tv style encryption? Assume a unidirectional and broadcast channel (everyone gets the same data, and can't send) because that's the hard part. Digital video though, not analog.
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Replying to @colmmacc
When you pay over a tls channel, vend a one-time use key. Then use the key to decrypt the content as it’s streamed to you? The key can be global per event to save on the broadcaster’s end.
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Replying to @JonathanMHenson
How do you get the key to my decoder, and only the subscribed decoders? Only one-way comms to the decoder :)
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Replying to @colmmacc
Doesn’t the fact that I paid mean I had to at least call out once from the device?
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Replying to @JonathanMHenson
No! Typically a cable subscriber has to phone their provider, or log into web site to subscribe. They give their decoder ID, or their account, and the provider "unlocks" the content for their decoder.
6:12 PM - 23 Oct 2018
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